libmemif: docs md->rst

Type: improvement

Change-Id: Ibebd2d47a4268189f11601d004073e4858548f25
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>

extras/libmemif/libmemif_doc.rst

@@ -0,0 +1,67 @@
+.. _libmemif_doc:
+
+Shared Memory Packet Interface (memif) Library
+==============================================
+
+Features
+--------
+
+-  ✅ Slave mode
+
+   -  ✅ Connect to VPP over memif
+   -  ✅ ICMP responder example app
+
+-  ✅ Transmit/receive packets
+-  ✅ Interrupt mode support
+-  ✅ File descriptor event polling in libmemif (optional)
+
+   -  ✅ Simplify file descriptor event polling (one handler for control
+      and interrupt channel)
+
+-  ✅ Multiple connections
+-  ✅ Multiple queues
+
+   -  ✅ Multi-thread support
+
+-  ✅ Master mode
+
+   -  ✅ Multiple regions
+
+-  ✅ Loopback
+
+Quickstart
+----------
+
+This setup will run libmemif ICMP responder example app in container.
+Install `docker <https://docs.docker.com/engine/installation>`__ engine.
+Useful link: `Docker
+documentation <https://docs.docker.com/get-started>`__.
+
+Build the docker image:
+
+::
+
+   # docker build . -t libmemif
+
+Now you should be able to see libmemif image on your local machine:
+
+::
+
+   # docker images
+   REPOSITORY                       TAG                 IMAGE ID            CREATED              SIZE
+   libmemif                         latest              32ecc2f9d013        About a minute ago   468MB
+   ...
+
+Run container:
+
+::
+
+   # docker run -it --rm --name icmp-responder --hostname icmp-responder --privileged -v "/run/vpp/:/run/vpp/" libmemif
+
+The interface will by default connect to a master interface listening on
+``/run/vpp/master.sock``. The example will handle ARP requests and
+respond to ICMPv4 requests to ``192.168.1.1``.
+
+Continue with :ref:`libmemif_example_setup_doc` which contains instructions on
+how to set up connection between icmpr-epoll example app and VPP-memif.
+